W5HFZ-W5RJG
RTTY Converter

Here is the diagram of the converter which Arlan and I worked
out. Believe there is room for improvement from the standpoint of
selective fading. Have been thinking of including the Gates
circuit, from the output of the discriminator transformer on
throught the ouput tube. The values shown for the tuned circuits
give a band-pass that is a good compromise. My tuned circuits use
larger capacitors, 0.2 and 0.15 mfd. to get narrower response,
and I have a five position switch with taps on the coils in both
the input and discriminator filters (on the high tone only) to
take care of the signals that do not have the correct shift. The
tapped portions of the coil consist of five turns between each
switch point. The capacitors remain the same. Of course you could
change them instead of the tapped coils.